Abstract
This study has focussed on the effect of low temperature storage on the postharvest ripening of green tomatoes; more specifically, on the ethylene signal transduction in relation to the ethylene biosynthesis pathway. To this end, the first elements of the ethylene signal transduction, ethylene receptors, CTR and EIN2 have been analysed in tomatoes stored at three different temperatures in terms of both their gene and protein expression levels. These results have been related to quality changes and enzymes and intermediates of the ethylene biosynthesis pathway to better understand the ethylene control of ripening under low temperatures. The first changes observed during low temperature storage took place at the ethylene biosynthesis level, which might enhance changes in the ethylene signal transduction. Although expression of most ethylene signalling genes decreased with chilling, none of the protein levels showed a significant decrease, pointing at a differential regulation at the gene and protein level.
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